Mini Spin Column: #1910-050/250, no lidsilica membrane mini spin column without lid #1920-050/250, w/ lidsilica membrane mini spin column wit attached lid Two types to choose from: with attached lid and without lid Designed with extra considerations for better performance and convenience. Improved o-ring configuration completely eliminates buffer carryover, cleaner DNA for sequencing, digestion and transfection. Large frosted area around the neck instead of the column body, helps to avoid markers smudged by ethanol containing wash buffer. Bed volume of 800ul, binding capacity of 30-40ug allow them to be directly plugged into your existing protocol. Sold with 2 ml collection tubes. Fits most vacuum manifold.规格：no lid w/ lid